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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48da7e8dcded59607fe78f985ff2fdd9cdde83b8c400bc1bbd13b478a48d25de' 
  AND token = '1NKJOyPCL/7bb9TZ1vZ853Oaqu5gGm7uPvJRZX1m2oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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