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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff239fd7cab38a32b999990a65c465210db817f3a213428bfd36932a125a9207' 
  AND token = 'I3kZjaarRpXw2gXuYn3u+N8/PSts+hjGRAbiLEwIoq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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