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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a460ee0314afbb5e9e941483a2da9481cf143714d9fda4c3e44392fa5f2715c' 
  AND token = 'st5dcYglcsCrHOCpQ/cTf8KS87/usNj8oJE551bahnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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