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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ab38c9c34e9ee462364cfb5c66db76b3c36ccd8b9806e15d802de1782153da' 
  AND token = 'fvTWW9hKdQb2I9lPRiDFrZB9K7fCvR2Lrohn4NWnsb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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