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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f4f11a98932f7864f10ce0d7d1390b042afda392c6437c3a2d993e273b896c' 
  AND token = '8tVzP6PMdXV/rjCt7nubddEWMSdQGq7Twg7U08pFpdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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