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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6d3308083a6a0f9cbde70b94806695fa521746afd6cbc0c37fbaeb8302bf53' 
  AND token = 'tAmH7iOmSG8QacnPLha4BKIjNvshg7e+s/lr55b4nBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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