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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170f13cc32187339f7772c4f46a268963756ec29ec8b103d893c801d9c0d5bf7' 
  AND token = 'CmToxZmvBr3FGvu4Z+SAZ626EINeTAaUo84zclHB82o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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