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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a649642612952daac84b5c9a8c47c237f202335350e399b2ceeb86f3a7333ca' 
  AND token = 'jsfTV0lol1ygAittfJcsFgO9FV6d4K2og8HV27gvIbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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