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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f2cd155a5a31b7af434d4bb300ba52869d0a2c2efb7d4f5260483f55e61929' 
  AND token = 'dH3jc8bbhasBouMxEauPaaHDdcsadlxUjChs1eKwRE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}