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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5cf006b0dcc7ff9b7897d5f516d7bc6e7328736c874ee1668dfc36be9e2b0f' 
  AND token = 'K8hwCQ68BYtdyCWJ91tXOnZpj5iOUWEGcAgJD4R895I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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