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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c0de64ff03ee56fc875f72625e7aee88ad022adf8fa02648138be68fc084be' 
  AND token = 'EK3DTA8w73XVfIBe52HvF6JSpe8HXLT+8fuEhYakjFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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