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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef19b16de1815e37e81e9a1680999c9afdde901694e105c40ee7eec53490a977' 
  AND token = '9S/GB/0BnUBeM8P/0jyBYl7IV5HkDWeL0OFUrYyLZao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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