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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522eff6c80f663c032ad44eff2cc7667b7832d6e6eb4ea2a2de7af1a4eb93cf7' 
  AND token = 'qB9kmpqzLDjNrmrMXNEDNI2R7IQ7StroY8/7Fdmwiek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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