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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92239a5fac177d14bf9b36fed8c8852e4f6fada604a7a7dc124c60a48c18ee50' 
  AND token = '7/jsMNoKZsoYr6ax1BexbVHMLSfuE8ap0QguAlfyQcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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