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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884678adbfa573c4b0c138e16ea378728388efbe24475164776ffec32d4af4d3' 
  AND token = 'p8CUi1TF7xETYyrEk8SS6KbezxF0U0S2ff6n49dtTCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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