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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8cefdb5eb44a5274b07f5161425006dcff0f97806ff652e830eb276525ce56' 
  AND token = 'V5szSu/sseVoYGtcgFN7NtGwZP4CiHscZDuWoGH/SfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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