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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bdbea91330e202731f4d36d80284f7e3263b579dc3bd174326abe470d9829e' 
  AND token = 'cwVVDGdt3VpwFxbiPNknhzGL9JIYm9aHJXiHrA/DpTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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