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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ec2539fd13333e52ac9523897145344aa5fdcf8632ac467ec5fe9264ef8075' 
  AND token = 'oyRUpl9vyBogeXy8/HWJWP+5sxASWOQeBgNhkP2LNxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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