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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfb0fda956f373ab982a4645c9b9e5cbb88abfd83b12e29bf03d8afa99f81eb' 
  AND token = 'xfWPrCcOF5X3QdxJ9rWDgL1f3Paq8nwK/GObd6fNKcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00142

JSON explain

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