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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b016a27f49aa5a12dcc4fe2829592b8045ea4e27fdf848ff34647a9ea994365' 
  AND token = 'aAnCvAJ/nvr7A7tAJlJ6d0hHXiE2A+tDc2SlnJ8HY00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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