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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2c570ce6c19a276d586b32f4dbdb0aaf5a991d23b39487c1c8a41614c4d607' 
  AND token = 'ldajgGY2GiKmtr4W1BBG5rOacwfDox5fHftla9JAJbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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