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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c409e89f69860e7a9fd80ea91f5afa046bd301d52cd35c407fe42eebb10793' 
  AND token = 'EBGxymFQcezgWFuYrcsT4tF6CkJlaPAbSCUpmjZ3M1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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