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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15eb6db1c201b56e4ccd95ca775391f62d33c847d57d2baaf74d76b756f2aa5d' 
  AND token = 'QaKRea900xvsAdwIPFoqPo7A6cDzogIU1rSdudAGPMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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