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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1090381be61c294cf56b7d4983cbd35287b131efff2eb2c5de94a2120956c6b7' 
  AND token = 'sTCyXGeWoRf+mGmT9+DWrdmwWH+YF2BjI3X1itp9LUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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