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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a6582b95059991171f6f8e4a7631f5408c042e02b66f857f3f9a6d0ef7dbcb' 
  AND token = '4ROxP00PwB9ZFJTZYGd0o5h7AJ/P/AHnX010TThkv38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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