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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24053baa0fcfd134a40376345304a3404416bf74e18cf9a73b9327c8093f3c3' 
  AND token = 'hEd5J6PDLtJR9gHrjG0uA7nViJqPborfR6SMYwzmwUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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