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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a234511f29c3f4215b0fd369048b947b37b81d835d9f47228334ae4f8d93fa' 
  AND token = 'CsfUkkCDbdwupX+Qw/X6dQA2xWpUROXLfe5fInsyvus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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