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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccaf742dc18a4b373c26eb24dd639d92235c6420af09a340b61e05d155d9626' 
  AND token = 'y8Al9XGhsDorasl4hpl9u1sTJ21MwgYFee7d6ZiSvNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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