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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c26ebe712e28b2bdf5cadd817c9214a0efa76c24d45de0d5a6dc7133021402' 
  AND token = 'LCrLHV4TNfXGDvqjBBzBER7BATIWCqoeS7sNv+KrDIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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