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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b94999d9f369d18c5a67c2d51214ef0e159a92c40c1b8a83bad3e32c05f0c88' 
  AND token = 'mihM0RH/cnPPZ6s3qPK4BLarvbB+ihy1A6onjV+Hvj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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