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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1330b91c217742b194c6bb0498589ea4c01adfe9d0762f0b1a5a9ed4e36024e' 
  AND token = 'Zn8feuTfoWEnyZRSYSYYgxAD0X2iSUbu5vkU/b7myCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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