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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b333f499d1624f4e923f4ab4a98cd511477c7081e387ffc94ccad8ac77ed7b' 
  AND token = 'pXJvb2dfg3qZ2mY/MBlfiRbUMTj0cU7bW0WEhpq5kPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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