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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df1ea29c7522eb3c9d74dc73ae4839f58ccd19581159e58d88fed26a857c2f8' 
  AND token = 'icduWgcWeMs/BohW2VryTn41ftAm62JoovtxfnhQQA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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