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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c1ec67805880221cffbc8e4cd683e06033d78c7538c2560b6dd0f7e6a576da' 
  AND token = 'NNzD1qaCGnXavQ5F2eUeXXy/z3t7mTMEe/Jnnr3QyVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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