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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986a751199cf1e287c1ab8ce9e07d8c66ab3fe4e1cec51800aa688ea3da0be94' 
  AND token = '0BghGxiYElR/hZYe88RXouqg8IXmutyb1xGJKgKqt5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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