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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be467ad476b19c15854a9ed2413e33d49fddd9b438278f21c9ddc640be9a50b' 
  AND token = 'iawj3Qkyhku6ga4nfE3skGoI4yuQv2x/BuiEdaxNRWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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