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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703c94b153490eca9d3f5cbdb004789c96d8c1fb8d7a82c3f4da9224779cdeed' 
  AND token = 'cbJ5iWDlqgSNwWqnvRIDs8AkJ9xsFP5324TMQSoYJOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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