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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a9def1b2a52407a3e1ac77403bf6dc64fcb2c24957ee5977d234a9d3b9a18c' 
  AND token = 'HEf68Uea2H0coH+JK+kY8UPnZX6JOCY586Dqrj3y0nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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