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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877a4c63ab893c4a8e4b8d87782f4db87a756bd59f67b8dcd7a2893963350de5' 
  AND token = '5x524jxxWGUDaX2AI5RGyAldpOQ+R2epa5hNcoECk44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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