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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5abbec2f72c74c26f68cb0c6128c4552d150c4fa4d48f3f688b7f6e65c194df' 
  AND token = 'fJNMCcbucG/2RkUqTLKDh/3iKdyR0Lvka6D6zEBcIZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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