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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d61c141ee306e653f32c5773811e9e18e54f9028da321359a521bd13638cea' 
  AND token = 'rvQ4FSMA1FgzHS3ehFCXCiI1ss0kADs58X/bDDdsJt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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