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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd231ba9fd042e6524a8399a8dfdf72f057ae287b2f8da46ca82cbee54f72fbaf' 
  AND token = 'u6uAoyupx95z7aeaDxwz/sH7b6CaILgh1E47nTJ81Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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