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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa3b7117223df881760c7341db0da2fd48923f0cd9fdfa91abba628684742d4' 
  AND token = 'qU06/e+w6VSO9necCscGQEThWsd+ehZX9mSBk2us4rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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