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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f315bb1aac9b275c70a472a64de2138cb3e017480880f67c719e0b89d6f71507' 
  AND token = 'xGdDaLejCRDpmqU7DUs0fKWV1ACo15yQ1YyiRU8qK0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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