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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cca18c8b14292421d5bcd564360692a90a8e5c9646276427f2a02195f24ceb7' 
  AND token = 'Svmt90SyDUtuCtTm5SCMMWT7zRzqsTNT8ZdiPJyyIvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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