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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a62334f9f1a52576bff58d59bf3fc49daae46aefaab3fb83ab6844384ca75fb' 
  AND token = '+eTOEjZBSAj5r0RbeXZt0CXavClTchXu6AOhGcaP0HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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