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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8583e9460c5beca2430f94d4af9e2c18cb7fa6de6fba057f4aff329b1a770b8' 
  AND token = 'wE9D9XIRDblApGUIQobwU7gWMXNpFQGJt5C5yow07TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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