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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fc7eaea42d08ac6b007d8da3499fab03c08117c8266b9bcee5033fba0c7772' 
  AND token = 'pEmM3x3UTd4q2Yg+hd9nqqGoRTk/NCDfVDN3Om3WxRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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