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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d993a2e1c8622cf7f1270c8cd347e9406491095b573b18208e09ac8fbdfe6f4' 
  AND token = '0UcIhJVOsv4hT7VXv//iTebcDgVDdmcSmwuGrsN5NkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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