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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a62b220721606bb083cd68de1e556e39c0edda2b17a6e91aca8787bb8b4a668' 
  AND token = 'yWr91klZbTRVLbKgD7RcqB2vkDyZ+A2+nqxVs4eKlho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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