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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46562fb10d67733a6a755bb6986a193906e1b61ed1cf6b08d58cd3d9d39105e0' 
  AND token = 'CPsh5K15x6wlwBybvt1b+jVe/rskt++DFflsldVtoKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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