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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a31eb5cf4be87422abfe339ac5e4876a276153f5c2d6dd68b84039e2f24bc37' 
  AND token = 'ucDX1Z2rnGsMVH/cxO2VS0KaMBYSI3AupaIIyNotxPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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