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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514c015eeee155c7e3e7b45765696681448ef8fda236c8e04f426d435e5367ff' 
  AND token = 'Eb2P9kHPo2jgmUnE4T736qQnrgGF2UhdhPThJ62gxaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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