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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796c781685aeab9f25ea4d74b8fd4fd06340af4e12111f9f0a88b01a58fa9f0d' 
  AND token = 'nwR22RmzEUmaWOXf68nZftGEoJBvVOMhsNuGnExTHPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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