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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616d3cb8b19e335edfeb8ab23bec94ed475dd013b88ad982d054915243c1b0a8' 
  AND token = 'vdIEv00mVndNnQ4TIOl7iY10zyP56k2pc1tZ0pqUWvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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