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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e6f567daacb3c62d404dbbfbc7fe6bcb90d1b69f8d11a06ee4e50636a4b2ad' 
  AND token = '4n6ACEvcz53RW2k4a9QNQ/zJPob/wSf6eEuu/53D6gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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