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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcc57ccfe1992bc567d53f29d5e9befb2643abd103d36a48ebcf49dc706c09b' 
  AND token = '9zVVrIKpto/9yI9pdNsfNY8IxkXrilx2G+QFTHakass=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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