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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fb212639ceeebd5accc2fc816c8d1c53aa526dbfc393f2154460d42b456d97' 
  AND token = '8Qj3QxhObsw1T9oWLDFCaFW5CftO+hd0+xj7/hnyl+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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