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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963a5475865f244046c67f837b64e1c5c69b92084e567c180a0d98ee85cf6421' 
  AND token = '+6MmpmXxkvLwAHqfGynxKcd9JR1lyxny39pT+E10LxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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