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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded6dcab40795dc3877224eda0ffceb5969f5fe8716731bcd444f99fbb89f4d6' 
  AND token = 'aPHMOqG+eDi5XFcu2Ld65jADSixfXMSbOeJ/D4WKS4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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