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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a67ea9c1932ae183b9ef2e25f8a8f6f8455c5de48a12fd0bf0a5782179b66ee' 
  AND token = '0Wm/43UVhDgnsMOS2oA3lRYyvVBYf8R1bS/ruVuzvcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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