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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a4168794ca6db0f6b9774bbd5b29eca1ab92559133bd09c3799402c6245130' 
  AND token = 'Y43Si622OMDuSuo8+i4WQi5XlpHUn7QN59NArGoeWFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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