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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2102c53003cec349475c750c4ed952d85f01b65ae675f43b4c0d54465f0f3db' 
  AND token = 'bl6Z4Ul8YNKGYjHWk1Yl9GildkZJIDPCQfcPP6DSWGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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