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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0392b32b597e361a47f668ed7c48797d84fbe4e20c865e733bc06cc21d37ee70' 
  AND token = 'Ik1I9vE0b3Wa02BP/GzE1COxsaodByG9Viyc/LPFZZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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