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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f94256afb041bb71df137c896f1b70b6d5881a5a78cde8d553b3dafeb52ac2' 
  AND token = 'jeZnI9mwfof6CCKUw9nN1eX05/IPnEwpQKov21cpuuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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