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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6e32d87b627c99aa09e2ab89caa50d90cdb6a00d7bcf6e5a153869cd773122' 
  AND token = 'A1agWfID5VJdEcUYoK6db5M6p1qNPu7LItW0KzU8lCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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