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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7026e603ffa9269f6acaedbd2a3025c9618cbf46dd8abf6d767fc1dabf9cfd1e' 
  AND token = 'XUt/dPc6yO8CCV7m0elr3Qo7TL5d1s0AAi6eV9JaKRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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